/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#include "itkIsolatedWatershedImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkTestingMacros.h"

#include <fstream>


int
itkIsolatedWatershedImageFilterTest(int argc, char * argv[])
{
  if (argc < 9)
  {
    std::cerr << "Missing parameters" << std::endl;
    std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv) << " InputImage"
              << " OutputImage"
              << " seed1_x"
              << " seed1_y"
              << " seed2_x"
              << " seed2_y"
              << " threshold"
              << " isolatedValueTolerance";
    std::cerr << std::endl;
    return EXIT_FAILURE;
  }

  constexpr unsigned int Dimension = 2;

  using PixelType = unsigned char;
  using ImageType = itk::Image<PixelType, Dimension>;

  const itk::ImageFileReader<ImageType>::Pointer reader = itk::ImageFileReader<ImageType>::New();

  reader->SetFileName(argv[1]);

  ITK_TRY_EXPECT_NO_EXCEPTION(reader->Update());


  // Create the IsolatedWatershedImageFilter object
  using FilterType = itk::IsolatedWatershedImageFilter<ImageType, ImageType>;

  auto filter = FilterType::New();

  ITK_EXERCISE_BASIC_OBJECT_METHODS(filter, IsolatedWatershedImageFilter, ImageToImageFilter);

  filter->SetInput(reader->GetOutput());

  FilterType::IndexType seed1{};
  FilterType::IndexType seed2{};

  // Test the seeds being outside the input image exception
  const ImageType::Pointer inputImage = reader->GetOutput();

  const ImageType::RegionType region = inputImage->GetLargestPossibleRegion();
  auto                        offset = ImageType::IndexType::Filled(10);

  seed1[0] = region.GetUpperIndex()[0] + offset[0];
  filter->SetSeed1(seed1);

  ITK_TRY_EXPECT_EXCEPTION(filter->Update());

  seed1.Fill(0);
  filter->SetSeed1(seed1);

  seed2[1] = region.GetUpperIndex()[1] + offset[1];
  filter->SetSeed2(seed2);

  ITK_TRY_EXPECT_EXCEPTION(filter->Update());


  seed1[0] = std::stoi(argv[3]);
  seed1[1] = std::stoi(argv[4]);
  filter->SetSeed1(seed1);
  ITK_TEST_SET_GET_VALUE(seed1, filter->GetSeed1());

  seed2[0] = std::stoi(argv[5]);
  seed2[1] = std::stoi(argv[6]);
  filter->SetSeed2(seed2);
  ITK_TEST_SET_GET_VALUE(seed2, filter->GetSeed2());

  const double threshold = std::stod(argv[7]);
  filter->SetThreshold(threshold);
  ITK_TEST_SET_GET_VALUE(threshold, filter->GetThreshold());

  constexpr PixelType replaceValue1 = 255;
  filter->SetReplaceValue1(replaceValue1);
  ITK_TEST_SET_GET_VALUE(replaceValue1, filter->GetReplaceValue1());

  constexpr PixelType replaceValue2 = 127;
  filter->SetReplaceValue2(replaceValue2);
  ITK_TEST_SET_GET_VALUE(replaceValue2, filter->GetReplaceValue2());

  constexpr double upperValueLimit = 1.0;
  filter->SetUpperValueLimit(upperValueLimit);
  ITK_TEST_SET_GET_VALUE(upperValueLimit, filter->GetUpperValueLimit());

  const double isolatedValueTolerance = std::stod(argv[8]);
  filter->SetIsolatedValueTolerance(isolatedValueTolerance);
  ITK_TEST_SET_GET_VALUE(isolatedValueTolerance, filter->GetIsolatedValueTolerance());

  ITK_TRY_EXPECT_NO_EXCEPTION(filter->Update());


  const double isolatedValue = filter->GetIsolatedValue();
  std::cout << "IsolatedValue: " << isolatedValue << std::endl;

  // Write the filter output
  using WriterType = itk::ImageFileWriter<ImageType>;
  auto writer = WriterType::New();
  writer->SetInput(filter->GetOutput());
  writer->SetFileName(argv[2]);

  ITK_TRY_EXPECT_NO_EXCEPTION(writer->Update());


  std::cout << "Test finished." << std::endl;
  return EXIT_SUCCESS;
}
